A reader writes:
It is true that PTSD has wide prevalence. But PTSD as a disorder is really a consequence of its designation as such in the Diagnostic and Statistical Manual of Mental Disorders (DSM), the same manual that once classified homosexuality as a mental disorder. As the attached paper (PDF) from a recent Psychiatric Annals suggests, PTSD my not be a disorder at all but rather a set of normal responses to traumatic events. Indeed, the mere fact of these responses being classified as disorder might be deleterious to recovery.